LM2575S-3.3 Equivalent & Substitute Parts

Part Overview

The LM2575S-3.3 is a buck switching regulator IC from Texas Instruments, part of the SIMPLE SWITCHER® series. It delivers a fixed 3.3V output at 1A from input voltages ranging from 4V to 40V, operating at a 52kHz switching frequency. The device is housed in a TO-263-6 (D2PAK) package with surface mount configuration.

This part carries a Last Time Buy status, indicating it is no longer in active production. Equivalent and substitute parts are necessary to maintain design continuity and ensure long-term component availability for new designs and production runs.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	LM2575S-3.3
Function	Step-Down (Buck)
Output Voltage	3.3V Fixed
Output Current	1A
Input Voltage Range	4V to 40V
Switching Frequency	52kHz
Package	TO-263-6 (D2PAK, 5 Leads + Tab)
Operating Temperature	-40°C to 125°C (TJ)
RoHS Status	ROHS3 Compliant
Product Status	Last Time Buy

Substitute Part Grouping Explanation

Substitution for the LM2575S-3.3 is determined by the following critical parameters:

Output Voltage: Must be fixed at 3.3V
Output Current: Minimum 1A (higher current ratings are acceptable for drop-in replacement)
Input Voltage Range: Minimum 4V to 40V (extended ranges are acceptable)
Package: TO-263-6 (D2PAK) with identical pinout
Switching Frequency: 52kHz nominal (minor variations acceptable)
Operating Temperature: -40°C to 125°C minimum
Topology: Buck (step-down) configuration

Substitute parts are grouped into three categories:

Direct Equivalents (Same Manufacturer): Texas Instruments parts with identical electrical specifications and packaging
Cross-Manufacturer Equivalents: Microchip Technology parts with matching or superior electrical specifications
Higher Current Variants: Parts with increased current ratings (3A) suitable for applications requiring additional headroom

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Min)	Input Voltage (Max)	Switching Frequency	Operating Temp	Package	Product Status
LM2575S-3.3	Texas Instruments	1A	4V	40V	52kHz	-40°C to 125°C	TO-263-6	Last Time Buy
LM2575S-3.3/NOPB	Texas Instruments	1A	4V	40V	52kHz	-40°C to 125°C	TO-263-6	Active
TL2575-33IKTTR	Texas Instruments	1A	4.75V	40V	52kHz	-40°C to 125°C	TO-263-6	Active
TL2575HV-33IKTTR	Texas Instruments	1A	4.75V	60V	52kHz	-40°C to 125°C	TO-263-6	Active
LM2575-3.3WU-TR	Microchip Technology	1A	4V	40V	52kHz	-40°C to 125°C	TO-263-6	Active
LM2576-3.3WU	Microchip Technology	3A	4V	40V	52kHz	-40°C to 125°C	TO-263-6	Active
LM2576-3.3WU-TR	Microchip Technology	3A	4V	40V	52kHz	-40°C to 125°C	TO-263-6	Active
MIC4576-3.3WU	Microchip Technology	3A	4V	36V	200kHz	-40°C to 85°C	TO-263-6	Active
MIC4576-3.3WU-TR	Microchip Technology	3A	4V	36V	200kHz	-40°C to 85°C	TO-263-6	Active

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Recommended)

LM2575S-3.3/NOPB is the primary recommended substitute. It maintains identical electrical specifications and packaging as the original LM2575S-3.3 while offering Active product status with confirmed long-term availability. This part is suitable for direct drop-in replacement without design modification.

Tier 2 - Texas Instruments Alternatives

TL2575-33IKTTR and TL2575HV-33IKTTR are Active Texas Instruments products with equivalent 1A output current and 52kHz switching frequency. The TL2575HV variant extends maximum input voltage to 60V, providing additional design margin for applications with higher input voltage transients. Both parts are ROHS3 compliant and carry identical moisture sensitivity ratings.

Tier 3 - Microchip Technology Cross-Manufacturer Equivalents

LM2575-3.3WU-TR from Microchip Technology provides electrical equivalence with Active status. This part maintains the original 1A output current specification and identical input voltage range (4V to 40V).

Tier 4 - Higher Current Variants

LM2576-3.3WU, LM2576-3.3WU-TR, MIC4576-3.3WU, and MIC4576-3.3WU-TR offer 3A output current capability. These parts are suitable for applications requiring additional current headroom or where design margin is critical. All maintain the 3.3V fixed output voltage and TO-263-6 packaging.

Tier 5 - Specialized Applications

MIC4576-3.3WU and MIC4576-3.3WU-TR operate at 200kHz switching frequency (versus 52kHz), enabling smaller external component sizing. However, these parts have a reduced maximum input voltage (36V) and operating temperature range (-40°C to 85°C ambient). Use only when the higher switching frequency benefit justifies the reduced specifications.

All recommended substitutes are ROHS3 compliant and carry MSL-3 moisture sensitivity ratings matching the original part.

Frequently Asked Questions (FAQ)

Q: Can I use LM2575S-3.3/NOPB as a direct replacement for LM2575S-3.3?

A: Yes. LM2575S-3.3/NOPB is electrically and mechanically identical to LM2575S-3.3. The primary difference is product status (Active versus Last Time Buy) and packaging format (Tube versus unspecified). No design changes are required.

Q: What is the difference between TL2575-33IKTTR and TL2575HV-33IKTTR?

A: Both parts are identical except for maximum input voltage. TL2575-33IKTTR supports 4.75V to 40V input, while TL2575HV-33IKTTR extends to 60V maximum input. Select TL2575HV-33IKTTR for applications with higher input voltage transients or wider input ranges.

Q: Can I use a 3A part (LM2576 or MIC4576) instead of the 1A LM2575S-3.3?

A: Yes. Higher current-rated parts are suitable for drop-in replacement in applications requiring only 1A output. The 3A variants provide additional design margin and thermal headroom. Verify that the reduced maximum input voltage (36V for MIC4576) and operating temperature range (-40°C to 85°C for MIC4576) meet your application requirements.

Q: Are all substitute parts available in the same TO-263-6 package?

A: Yes. All listed substitute parts use the TO-263-6 (D2PAK, 5 Leads + Tab) package with identical pinout compatibility. Packaging format (Tube, Tape & Reel, or Cut Tape) varies by part number but does not affect electrical or mechanical compatibility.

Q: What is the significance of the switching frequency difference in MIC4576 parts?

A: MIC4576 operates at 200kHz versus 52kHz for LM2575S-3.3. The higher frequency allows use of smaller external inductors and capacitors, reducing board space. However, higher switching frequency may increase EMI and requires careful PCB layout. Verify that your application design can accommodate the higher frequency before substitution.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification and are suitable for applications requiring RoHS compliance.

Q: What is the difference between packaging options (Tube, Tape & Reel, Cut Tape)?

A: Packaging format affects handling and automated assembly compatibility but not electrical performance. Tube packaging is suitable for manual assembly or low-volume production. Tape & Reel (TR) and Cut Tape (CT) formats are optimized for automated pick-and-place assembly. Select based on your manufacturing process requirements.

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